package com.lox;

abstract class Expr 
{
    static class Binary extends Expr 
    {//左 运算 右
        Binary(Expr left, Token operator, Expr right)
        {
            this.left = left;
            this.operator = operator;
            this.right = right;
        }

        final Expr left;
        final Token operator;
        final Expr right;
    }    
}
